View Code of Problem 27

#include<bits/stdc++.h>

using namespace std;

int main(){
	int m,n;
	while(cin>>m>>n){
		if(m>n){
			int temp=n;
			n=m;
			m=temp;
		}
		long long sum=0;
		for(int i=m+1;i<n;++i){
			int flag=0;
			for(int j=2;j<=sqrt(i);++j){
				if(i%j==0){
					flag=1;
					break; 
				}
			}
			if(flag==0){
				sum+=i;
			}
			
		}
		if(m==0){
				sum-=1;
			}
		cout<<sum<<endl;
	}
}
/*
Main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
 #include<bits/stdc++.h>
         ^~~~~~~~~~~~~~~
compilation terminated.
*/